Telephone instrument base



FIG. 1 is a left side, top and front perspective view of a telephone instrument base, showing my new design;

FIG. 2 is a top plan view thereof;

FIGS. 3 and 4 are respectively front and rear elevational views thereof.

FIG. 5 is a left side elevational view thereof; and

FIG. 6 is a right side elevational view thereof.

The broken line showing of the handset in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a telephone instrument base, as shown and described. 